High-sensitive and fast-adaptive fiber-optic interferometer based on photorefractive diffusion holograms multiplexed in CdTe:V crystal

This work presents an adaptive fiber-optic interferometer which is based on multimode optical fiber (MOF) as a sensor and diffusion holograms recorded in semiconductor PR crystal CdTe:V without any electric field as adaptive phase demodulators. Vectorial mixing of light waves (lambda = 1064 nm) with different polarization states (linear and elliptical) in the geometry of anisotropic diffraction makes possible to avoid applying electric field to the crystal for realization of linear phase-to-intensity transformation. At the same time recording of the hologram at high spatial frequencies (Lambda ap 0.19 mum) in the reflection geometry with appropriate concentration of PR centers allows to increase both hologram efficiency and, as a sequence, interferometer´s sensitivity without applying external electric field to the crystal.